#include<iostream>

int main()
{
	int c, s;
	float p, w, d, f;
	cout << "cin p,w,s";
	cin >> p >> w >> s;
	if (s >= 3000)c = 12;
	else c = s / 250;
	switch (c)
	{
	case 0:d = 0; break;
	case 1:d = 2; break;
	case 2:
	case 3:d = 5; break;
	case 4:
	case 5:case 6:case 7:case 8:case 9:case 10:case 11:case 12:d = 10; break;


	}

	f = p * w*s*(1 - d / 100);
	cout << "freight=" << f << endl;
	return 0;
}